ASELSAN REHİS (Radar, Electronic Warfare, and Intelligence Systems Group) carries out its studies at ASELSAN's Gölbaşı campus in Ankara. Established on 350 acres, REHİS has 75,000 square meters of indoor space and has around 1,800 employees here (about 60% are engineers). The Radar, Electronic Warfare, and Intelligence Systems Group conduct intense R&D and all kinds of engineering activities, from the chip level to integrated circuit designs and LRUs, including platform integration and qualification. REHİS also carries out system, subsystem, and platform-level integration and qualification activities, as well as design, production, and testing for microwave modules, boards, antennas, radomes, and embedded software. 

There are several large towers at ASELSAN's Gölbaşı campus to measure and evaluate antenna arrays and electronic warfare systems in phase space and far-field conditions. There are also four antenna test chambers inside the building with an infrastructure of up to 110 GHz to conduct tests in near-field and compact-field. ASELSAN uses its test center in Ankara Gölbek mostly to find the correct placement of antennas on platforms at communication frequencies (ranging from 20 MHz to 6 GHz) and to collect calibration data. ASELSAN also has EMI/EMC accredited laboratories in the center.